[CentOS] LVM problem

Hi,

I have CentOS 5.0 which use an old hard disk.   And recently I found
there are some bad sector on it ... I try to backup my data to other
CentOS 5.0 box ....

What I did is.  I remove the old HD (with bad sector) and install it as
a slave IDE on a working CentOS 5.0 ... I try to mount the old HD as
/mnt/oldDisk but since it's a LVM, the "mount -t ext3" doesn't work.

I'm new to LVM ... could someone help me on this.

Also, there is a problem I found.   Both HD have the
same VG called /dev/VolGroup00 ...

server:[root]/dev> pvscan
  PV /dev/hdb2   VG VolGroup00   lvm2 [76.22 GB / 0    free]
  PV /dev/hda2   VG VolGroup00   lvm2 [76.22 GB / 0    free]
  Total: 2 [152.44 GB] / in use: 2 [152.44 GB] / in no VG: 0 [0   ]


where the /dev/hdb2 is the old one with bad sector ... and it's unmounted.
The /dev/hda2 is the root filesystem of the working CentOS 5.0


Regards
KC